1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * AD714X CapTouch Programmable Controller driver (I2C bus)
4 *
5 * Copyright 2009-2011 Analog Devices Inc.
6 */
7
8 #include <linux/input.h> /* BUS_I2C */
9 #include <linux/i2c.h>
10 #include <linux/module.h>
11 #include <linux/types.h>
12 #include <linux/pm.h>
13 #include "ad714x.h"
14
ad714x_i2c_write(struct ad714x_chip * chip,unsigned short reg,unsigned short data)15 static int ad714x_i2c_write(struct ad714x_chip *chip,
16 unsigned short reg, unsigned short data)
17 {
18 struct i2c_client *client = to_i2c_client(chip->dev);
19 int error;
20
21 chip->xfer_buf[0] = cpu_to_be16(reg);
22 chip->xfer_buf[1] = cpu_to_be16(data);
23
24 error = i2c_master_send(client, (u8 *)chip->xfer_buf,
25 2 * sizeof(*chip->xfer_buf));
26 if (unlikely(error < 0)) {
27 dev_err(&client->dev, "I2C write error: %d\n", error);
28 return error;
29 }
30
31 return 0;
32 }
33
ad714x_i2c_read(struct ad714x_chip * chip,unsigned short reg,unsigned short * data,size_t len)34 static int ad714x_i2c_read(struct ad714x_chip *chip,
35 unsigned short reg, unsigned short *data, size_t len)
36 {
37 struct i2c_client *client = to_i2c_client(chip->dev);
38 int i;
39 int error;
40
41 chip->xfer_buf[0] = cpu_to_be16(reg);
42
43 error = i2c_master_send(client, (u8 *)chip->xfer_buf,
44 sizeof(*chip->xfer_buf));
45 if (error >= 0)
46 error = i2c_master_recv(client, (u8 *)chip->xfer_buf,
47 len * sizeof(*chip->xfer_buf));
48
49 if (unlikely(error < 0)) {
50 dev_err(&client->dev, "I2C read error: %d\n", error);
51 return error;
52 }
53
54 for (i = 0; i < len; i++)
55 data[i] = be16_to_cpu(chip->xfer_buf[i]);
56
57 return 0;
58 }
59
ad714x_i2c_probe(struct i2c_client * client)60 static int ad714x_i2c_probe(struct i2c_client *client)
61 {
62 struct ad714x_chip *chip;
63
64 chip = ad714x_probe(&client->dev, BUS_I2C, client->irq,
65 ad714x_i2c_read, ad714x_i2c_write);
66 if (IS_ERR(chip))
67 return PTR_ERR(chip);
68
69 i2c_set_clientdata(client, chip);
70
71 return 0;
72 }
73
74 static const struct i2c_device_id ad714x_id[] = {
75 { "ad7142_captouch", 0 },
76 { "ad7143_captouch", 0 },
77 { "ad7147_captouch", 0 },
78 { "ad7147a_captouch", 0 },
79 { "ad7148_captouch", 0 },
80 { }
81 };
82 MODULE_DEVICE_TABLE(i2c, ad714x_id);
83
84 static struct i2c_driver ad714x_i2c_driver = {
85 .driver = {
86 .name = "ad714x_captouch",
87 .pm = pm_sleep_ptr(&ad714x_pm),
88 },
89 .probe = ad714x_i2c_probe,
90 .id_table = ad714x_id,
91 };
92
93 module_i2c_driver(ad714x_i2c_driver);
94
95 MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver");
96 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
97 MODULE_LICENSE("GPL");
98